Link adaptation in massive MIMO: Throughput-fairness trade-off

Steve Blandino, Claude Desset, Alessandro Chiumento, Andre Bourdoux, Liesbet Van der Perre, Sofie Pollin

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)

Abstract

The fifth-generation cellular networks aim to provide uniform and very high throughput. Massive MIMO is widely seen as the most promising 5G radio technology as it promises very high throughput to many users while also guaranteeing fairness, thanks to the channel hardening effect limiting the small-scale fading. A key question though is to what extent this achieved throughput is homogeneous among users, and what degrees of freedom exist to improve fairness. A promising option to provide uniform throughput using Massive MIMO would be a proper power control, based on long-term channel statistics. This paper studies the trade-off between throughput and fairness and it compares different power-allocation schemes. Assuming users affected by log-normal large-scale fading, simulations show that the trade-off is critical. as user-dependent differences caused by large-scale fading are causing unfairness in the system and fairness is achieved at the price of throughput reduction. In a limited large-scale fading scenario, throughput or fairness optimization is possible without incurring huge losses on the other dimension. For heavy large-scale fading scenarios the cost of enforcing fairness is very large: more than 50% of throughput reduction is observed. Despite the critical trade-off, Massive MIMO is shown to be less sensitive to throughput losses when enforcing fairness, compared with traditional communication systems.
Original languageEnglish
Title of host publication2017 IEEE Symposium on Communications and Vehicular Technology (SCVT)
Number of pages6
ISBN (Electronic)978-1-5386-2256-8
DOIs
Publication statusPublished - 2017
Externally publishedYes
EventIEEE Symposium on Communications and Vehicular Technology, SCVT 2017 - Leuven, Belgium
Duration: 14 Nov 201714 Nov 2017

Conference

ConferenceIEEE Symposium on Communications and Vehicular Technology, SCVT 2017
Abbreviated titleSCVT 2017
CountryBelgium
CityLeuven
Period14/11/1714/11/17

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